What are the cell cycle phases?

The cell cycle phase, also called phases, are part of the cell cycle of cells. In the cell cycle there are four phases, phase 1 spaces (G1), synthesis (s), phase 2 (g2) and mitosis (m). Mitosis is further divided into four phases, profasses, metaphase, anaphase and telophase. Some descriptions of the cell cycle stages include the third phase of gaps known as the G0.

Phase G1, S and G2 are collectively known as interifase. The cell in the G1 phase actively increases and undergoes metabolic changes that are necessary for cell division. The G1 phase ends at the restriction point where the cell "decides to" undergo division and moves to the S.

All DNA cells are replicated during the cell phase synthesis phase. During DNA or replication synthesis, special cell components separate the double -grain Helix DNA into two individual sources. The enzyme called DNA polymerase then goes along each template spring of the bottom and builds on the other side if you want to exactly copy the original DNA of the cell. Other enzymes in cell control to ensure thatE was copied correctly. The final result of the synthesis is two accurate two -grain copies of the original DNA cells called chromosomes.

cells are prepared for mitosis during the second phase of the gap. In the cytoplasm cells are required special materials to make mitosis. The cell is subject to metabolic changes during G2 to form these cytoplasmic materials.

After G2, mitosis begins with a professional stage. During this phase, a structure is known as a mitotic spindle. Another structure called centrosom duplicates itself and duplicates move to the opposite end of the cell. Chromosomes move towards the area of ​​the mitotic spindle called metaphase plate and centromers connect to the spindle using structures known as kinetochores. This last step Prophase is sometimes further divided into a phase called Prometaphase.

During metaphase, chromosomes are helpful in accordance with a metaphase plateSeparate correctly during anaphase. Once the chromosomes are aligned, anapase occurs when the chromosomes are separated and moved to the opposite ends of the cell. Separate chromosomes are called daughter chromosomes.

Telophase is the final phase of mitosis and the phase of the cell cycle. Chromosomes acquire their own nuclear membranes and the spindle fibers separate and disappear. However, the cell distribution is not complete until the cytokinesis and the cell are completely divided into two new cells. At this point, the cell cycle begins again with G1.

Some scientists include the fifth phase of the cell cycle. The G0 phase is inserted between mitosis and G1. If the cells enter the G0 phase, it does not grow. However, they can re -activate and re -enter the G1 phase.